Lamp



FIG. 1 is a perspective view showing the lamp of my design;

FIG. 2 is a front elevation view of the lamp with the rear elevation view being identical thereto;

FIG. 3 is a right side elevation view of the lamp with the left side elevation view being identical thereto;

FIG. 4 is a top plan view of the lamp; and,

FIG. 5 is a bottom plan view of the lamp.

The broken lines showing a base for the lamp are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a lamp, as shown and described. 